JPH0232046B2 - SEIKEIROORUSUTANDO - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an improvement of a forming roll stand in a welding pipe making machine.

BACKGROUND TECHNOLOGY The forming rolls of a welding pipe-making machine are generally subjected to strong pressure to form pipe-making materials, so they are subject to severe wear and must be replaced each time. Furthermore, if the diameter of the in-process molded pipe changes, it must be replaced with one with a surface curve that matches the pipe diameter, so replacement is frequent. However, for this exchange, the conventional stand structure
(1) Disassemble the driven side roll stand and the upper and lower roll shafts, remove the roll stand, remove the upper and lower rolls from their respective shafts, install replacement rolls, and reassemble them as before. (2)
A set of spare stands, forming rolls, and bed assemblies is prepared, and the above set is removed from the coupling part of the drive shaft and replaced, (3) along the pipe-making flow direction. (4) A structure in which forming roll assemblies are provided on each of the four sides, top, bottom, left and right around a horizontal axis, and each assembly can be replaced by rotating in a plane by 90 degrees around the horizontal axis; It is equipped with forming roll assemblies for one set on the left and right with respect to the pipe flow direction, and these two assemblies have the same bed, and the bed can be slid left and right on the base, and during operation. There were some cases in which one of the assembled parts was located on the pipe-making line.

Problems to be Solved by the Invention However, according to the conventional manufacturing method described above, in the case of (1), it takes a lot of time and effort to remove the driven side stand and replace the roll, and during that time, the pipe making machine stops. Therefore, productivity is low. In the case of (2), it is difficult to prepare one spare assembly for each size of pipe due to storage space, etc., so if necessary, install rolls of the required diameter on a spare stand. It is necessary to install and replace it, which reduces productivity as described above. In addition, (3) has the effect of reducing downtime, but requires large-scale equipment and can only prepare assemblies of four different diameters at most. Furthermore, as in (3) above, (4) requires a large space for sliding left and right, and only two diameters of assemblies can be prepared, so if rolls of other diameters are required, Similar to (1) and (2) above, there were problems such as long stop times.

The present invention generally solves these drawbacks, enables roll replacement in a short time and easily according to the required diameter of the forming roll, prevents a decrease in productivity, is inexpensive, does not take up much space, and requires less maintenance. The purpose of the present invention is to provide a forming roll stand that can improve workability.

Means for Solving the Problems In order to achieve the above object, the present invention has a configuration in which one end of the upper and lower roll shafts 3 and 4 is supported by the driven roll stand 12, and the other end of the roll shafts is supported by the driven roll stand 12. are mating male shafts 31 and 41, and these mating male shafts are keyed to the mating female shafts 7a and 7b connected to the vertical drive shafts 5a and 5b, respectively, on the drive side roll stand 11. They are coaxially inserted through 32 and 42. The driven side roll stand 12 is erected on a half bed 2a that is slidable on the stand bed 2 toward the non-drive side.

Embodiment The present invention will be explained below based on an embodiment shown in the drawings.

In FIG. 1, a forming roll stand 1 of the present invention includes a driving side stand 11 and a driven side stand 1.
2, an upper roll shaft 3 and a lower roll shaft 4 are rotatably supported, and an upper roll 3a and a lower roll 4a are fixed with keys to the upper and lower roll shafts 3 and 4, respectively. The driving side roll stand 11 is attached to the stand bed 2, and the driven side roll stand 1 is attached to the stand bed 2.
2 is erected on a half bed 2a which is slidable on the stand bed 2 in the direction opposite to the drive side. The vertical drive roll shafts 3 and 4 are vertical drive shafts 5a and 5b, respectively, made of a universal joint.
from the drive side stand 1 via the coupling rings 6, 6.
1, the fitting female shafts 7a, 7b are connected to the bearing 9.
The shaft is mounted and driven via the shaft, thereby imparting rotation. That is, according to the present invention, one end of the upper roll shaft 3 and the lower roll shaft 4 is supported by the driven roll stand 12, and the other end of these roll shafts becomes the mating male shafts 31, 41. ing. The upper and lower fitting male shafts 31 and 41 are respectively connected to the fitting female shaft 7.
The key 32 is coaxially inserted into the keys 32 and 7b.
Rotation is prevented by 42.

A hydraulic cylinder 8 that is driven along the roll axis direction is attached to the stand bed 2, and the half stand 2a is moved to one side on the bed 2 by the cylinder 8, and the mating male shafts 31 and 41 are fitted together. The structure is such that it can be pulled out from the female shafts 7a and 7b.

The upper and lower roll shafts 3 and 4 have upper and lower rolls 3a and 4a.
Key grooves 3b and 4b are provided in the portion where the holder is mounted, and a key (not shown) is used to prevent rotation and to position the holder in the axial direction.

To replace the upper and lower rolls 3a, 4a, operate the hydraulic cylinder 8, move the half stand 2a to one side, detach the mating male shafts 31, 41 from the mating female shafts 7a, 7b, and then replace the upper and lower rolls. While the male shaft side portion of the roll shaft is suspended by appropriate means, the driven roll stand 12 is rotated 180 degrees in a horizontal plane, for example, as shown in the second figure. In this posture,
Since the upper and lower rolls 3a and 4a are replaced,
The work is easy, and all you need is a roll of the size that matches the diameter of the pipe in progress. After the roll replacement of the stand 12, the roll shafts 3 and 4 are assembled to the drive shafts 5a and 5b in the reverse order to complete the replacement work.

In addition to the above embodiment, the replacement work may be carried out by lifting the unfitted driven roll stand 12 with a crane or the like and transporting it to another location.

The present invention is applicable not only to forming rolls of welding pipe making machines but also to other roll stands of the same type.

Effects of the Invention As described above, the roll shaft is separated from the drive shaft while being supported by the driven roll stand, so the roll replacement work can be carried out easily and in a short time, and the construction for this work is improved. The downtime of pipe machines, etc. can be shortened, and the operating rate of pipe making machines has been greatly improved. Moreover, according to the invention:
There is no need for large-scale equipment or a large installation area. Furthermore, since it is sufficient to prepare only a replacement roll as a spare part, repair costs are significantly reduced.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of the present invention, and FIG. 2 is a front view of main parts showing a state of repair work. 1... Roll stand, 11... Driving side roll stand, 12... Driven side roll stand, 2
...Stand bet, 2a...Half bet, 3
...Upper roll axis, 4...Lower roll axis, 31, 41
...Matching male shaft, 3a...Upper roll, 4a...Lower roll, 5a, 5b...Drive shaft, 7a, 7b...Matching female shaft, 8...Hydraulic cylinder.

Claims (1)

[Claims] 1 One end of the upper and lower roll shafts 3, 4 is supported by the driven roll stand 12, and the other end of these roll shafts is a mating male shaft 31, 41. is the drive side roll stand 11
At the top, the female fitting shafts 7a and 7b connected to the vertical drive shafts 5a and 5b are fitted coaxially with each other, with rotation prevented, and the driven side roll stand 12 is rotated on the stand bed 2. A forming roll stand, characterized in that it is erected on a half bed 2a that is slidable toward the drive side.